Drill-steel-retaining device



May 20, 1930.

C. A. HULTQUIST DRILL STEEL RETAINING DEVICE Filed Feb'. 16, 1925 Patented May 20, 1930 CHARLES A. HULTQUIST, OF LOS ANGELES, CALIFORNIA DRILL-STEEL-RETAINING DEVICE Application 'filed. February This invention relatesto device'sof the character employed for preventing the drill steel from becoming detached from the chuck in which'it is loosely seated, and an object of this invention is to produce a device of this character of comparatively simple construction and one that can be readily thrown into- I and out of steel-retaining position.

the successive blows of they abutment or shoulder on the drill-steel against the retainer, for the retainer to be dislodged from its drill-steel retaining position which, ac-

cordingly,'will drop out of the chuck. The

' steel also being shown. In using that type of drill-steel-retainer .10 pivotally connected with the barrel of the' drilling machine, there is a tendency, under abutment or shoulder on the drill steel, for" cooperation with the retainer to prevent the drill steel dropping out of the chuck, is close to the outer end of the chuck during the opera-- tion of the drill against relatively hard mate rial, but when the drill steel strikes soft material it is driven thereinto to an extent that will cause the abutmentor, shoulder onthe drill steel to move away from the barrel of the drilling machine .asuflicient distance to strike-against the retainer which, if of the type mentioned above, will be thrust to one side. An object of this invention is to con- 30 struct the retainer so as to prevent such acci dental-release of the retainer, thus avoidingdropping of the drill steel in the hole being drilled.

hereinafter.

The accompanying drawings forms of the invention:

Fig. 1 is a side view of a drill steel retaining device constructedin accordance with the provisions of this invention and mounted in drill-steel-retaining position upon a drilling machine which is also shown. =A drill steel is inplace in the barrel. l V

Fig. 2 is aplan section on the line indicated by 22, Fig 1. Fig. 3 is an enlargedfragmental elevation of the drill-steel-retaining device looking to ward the left in Fig. 1, the barrel and a fragment of the drill steel being shown. Theopen illustrate two Other objects and advantages will appear 16, 1925. Serial No. 9,480.

position of the drill-steel retaining device is indicated in broken lines.

Fig. 4 is an enlarged sectional detail on the line indicated by 44, Fig. 1.

- Fig. "5 is a side view of a different form of drill-steel retaining device','embodying the invention, fragments of the barrel and drill- Fig. 6 is an elevation from the right of Fig. 5. V

A drill steel is indicated at 7 and is provided with a shoulderor abutment 8 spaced from the head of the drill which is inserted in a barrel 9 of a drilling machine, indicated in general by the character 10. The drilling machine 10, in the instance shown, is of the type employed for drilling down holes, butit is to be understood that the invention can be used with other types of drilling machines. The drill steel .7 can readily slide in and out 7 of the barrel 9, when the retaining means, hereinafter to be described, are not in such position as to prevent such movement of the drill steel, as is readily understood by those skilled in this'art.

To retain the head of the drill steel in the barrel, during the drilling operation, the outer face of the abutment 8 engages a semicircular abutment 11 which partly surrounds the drill steel when said-drill steel is in place so as. in Fig. 1.

' ,The semicircular abutment 11 forms the intermediate portion of a U-shaped member or retainer which also comprises arms 12. The arms 12 are provided with fixed bear-. v ings 13' journaled upon pivots or studsl projecting laterallyfrom the periphery of the barrel 9. The arms 12 pass through the studs 14 and are provided on their ends with spring retainers 15 which may be nuts screwed onto-the ends of-saidarms. Slidably mounted onthe arms 12 are other bearings 16 which are journaled on the studs 14: opposite to the bearings 12 and the bearings 16 are normally held toward thestud's 14 by coil springs 17 positioned on the arms 12 between the retainers 15 and the bearings 16. The springs 17 also-hold the arms in position to press the bearings 13 against the studs.

At least Toneof the'studs 14 and bearings 16 have interlocking parts of suitable construction and, in this instance, each of said bearings, is provided with a curved projection or ear 18 which, when the retainer is in position to retain the drill steel, engages in a curved recess 19 in the periphery of the stud 14. When pressure is brought to bear against the steel retainer, to swing the same from the steelretaining position shown in solid lines in Fig. 3 to the open position indicated in broken lines in said figure, the ears 18 will be caused to ride out of the recesses 19, thus sliding the bearings 16 on the arms 12 against the force of the springs 17. hen the steel retainer is swung into the open position, the semicircular abutment 11 is out of the path of movement of the abutment 8, thus permitting withdrawal and replacement of the drill steel. I

It has heretofore been stated that a rapid succession of blows of the drill steel will tend to swing the retainer into the open position and, to prevent this, there are provided on the ends of the semicircular abutment 11 shoulders 20 which, when the abutment 8 on the drill steel is in contact with the semicircular abutment 11. will lie adjacent to the periphery of the abutment 8, said shoulders 20 being at that side of the drill steel opposite to the side toward which the semicircular abutment 11 swings into the open position. Thus, when the abutment 8 is positioned a predetermined distance from the barrel 9, said abutment 8 engages the abutment 11, as

shown in solid lines in Fig. 3, making it impossible to swing the retainer into the open position and, accordingly, a rapid succession of blows of the abutment 8 upon the semicircular abutment 11 cannot dislodge the retainer from the steel-retaining position.

It has hereinbefore been stated that the arms 12 pass through the studs 14 and, to properly fulcrum the arms 12 in the studs so that said arms can turn relative to said studs, the holes 21 through the studs, for passage of the arms 12, taper outwardly from the middle portion of the holes, as clearly shown in Fig. at, the diameter of the holes at the middle thereof being substantially the same as the diameter of the arms 12 so as to prevent loosening of the arms in the studs. ".lhe tapered construction of the holes permils of the arms being swung in one direction to a sufficient extent to clear the drill steel.

N ow referring more particularly to Figs. and 6 for another form of the invention there illustrated, the parts shown therein that function the same as the parts hereinbefore described, will be designated by the same reference characters with the suffix a-. The main differenct in the construction between this form of the invention and that previous- 1y described is that, in the form shown in Figs. and 6, the arms 12 do not pass through holes in the studs 14 but said arms are forked, as indicated at 22, thus passing on either side of the studs 14, as clearly shown in Fig. 6, the base portions of the forks constituting the bearings 13. The bearings l6 are slidably mounted on the forked portions 22 and the spring retainers are held in place on the forked portions 22 by nuts 23. The springs 17, in this instance, engage studs 24 projecting from the intermediate portions of the spring retainers 1f and bearings 16, said springs being disposed between the forked portions 22 of the arms.-

It will be readily understood that this form of the invention operates the same as the form of the invention shown in Figs. 1 to 4.

I claim:

1. The combination with the barrel of a drilling machine, said barrel adapted to receive a drill steel in one end, of studs projecting laterally from opposite sides of the barrel and each provided with a tapered hole, a drill steel retainer having a portion engageable with an abutment on a drill steel in the barrel and having arms passing through the holes from the side of the studs adjacent the drill-steel end of the barrel, said arms having relatively fixed bearings engaging the studs at said sides, bearings slidable on the arms in engagement with the opposite sides of the studs, one of the bearings and one of the studs having parts interlocking when the retainer in position to retain the drill steel, and springs on the arms holding the slidable bearing engaged with the studs.

2. The combination with the barrel of a drilling machine, said barrel adapted to receive a drill steel in one end, of studs projecting laterally from opposite sides of the barrel, a drill steel retainer having a portion ongageable with an abutment on a drill steel in the barrel and having arms provided with relatively fixed bearings engaging the studs, bearings slidable on the arms, in engagement with said studs at the sides thereof opposite the sides adjacent the drill-steel end of the barrel, one of the slidable bearings and one of the studs having parts interlocking when the retainer is in position to retain the drill steel. and springs on the arms holding the slidable bearings engaged with the studs.

8. The combination with the barrel of a drilling machine, said barrel adapted to receive a drill steel in one end, of studs projecting laterally from opposite sides of the barrel, a drill steel retainer having a portion engageable with an abutment on a drill steel in the barrel and having arms provided with relatively fixed bearings engaging the studs, bearings slidable on the arms in engagement with said studs atthe sides thereof opposite the sides adjacentthe drill-steel end of the barrel, the slidable bearings and the studs having parts interlocking when the retainer is in position to retain the drill steel, and springs on the arms holding the slidable bearings engaged with the studs.

4. The combination with the barrel of a drilling machine, of studs projecting laterally from opposite sides of the barrel, a drill steel retainer engageable with an abutment on a drill steel projecting from the barrel, said retainer having relatively fixed bearings engaging the side of the studs that are turned toward the abutment, bearings slidably mounted on the retainer and positioned at the opposite sides of the studs from the relatively fixed bearings, nuts on the drill steel retainer, and coil springs between the nuts and the last mentioned bearings, one of the studs having a curved recess and one of the slidably-mounted bearings being provided with a curved ear adapted to extend into and to be retained in the recess when the retainer is in position to engage the drill steel and also when shifted by the drill steel.

5. The combination with the barrel of a drilling machine, said barrel adapted to receive a drill steel in one end, and a drill steel in the barrel, of pivot means extending to the side of said barrel, a drill steel retainer having a portion at the end of said barrel engageable by an abutment on said drill steel and having means extending to the side of said barrel and provided with bearing means engageable with said pivot means at the side thereof eX- tending toward the drill-steel end of the bar-V rel, another bearing means slidable on the means of the retainer extending to the side of said barrel, said slidable bearing means being engageable with the opposite side of said pivot means, and a spring for holding said slidable bearing means at all times in engagement with said pivot means, said slidable bearing means and said pivot means having positive and mutual interlocking and recess means to prevent ready rotation of said retainer about said pivot means, and adapted to remain in interlocked relation when said retainer is forced outwardly by the abutment 011 said drill steel.

Signed at Los Angeles, California, this 5 day of February, 1925.

CHARLES A. HULTQUIST. 

